Alternative bright and shady skies, a persisting westerly burst of winds blowing at around 18 km/h, and oppressive heat made worse by a humidity of 66 per cent and mercury at 32 deg Celsius at 11 am.

At Thiruvananthpauram, gateway to the southwest monsoon, a hint of an approaching thunderstorm loomed as the morning wore on June 1, long-considered the date of onset.

But the thunderstorm would at best be the extension of the summer showers, with the first burst of monsoon rain still thought to be at least four days away.

India Met Department said in its morning bulletin that conditions were becoming favourable for the onset over parts southeast Arabian Sea, some distance away from the Kerala coast, over the next three days.

But the wind flow projections suggest that the onset over Kerala, which announces the arrival of the monsoon over the mainland, may not happen until June 6.

Winds have to be predominantly westerly to southwesterly clocking at 27- to 37 km/hr for precipitating the onset. This looks quite some days away, as per forecasts.